DAF XF105. Manual - part 85

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System description

DMCI ENGINE MANAGEMENT SYSTEM

XF105 series

1. SYSTEM DESCRIPTION

1.1 INTRODUCTION

The design, functions and controls of the "DMCI" 

engine management system are described in this 

systems manual.

"DMCI" stands for DAF Multi Controlled Injection. 

Fuel injection is controlled by an electronically 

controlled pump unit and an electronically 

controlled injector.

The pump unit is responsible for the fuel supply to 

the injector. Injection timing is determined by the 

injector. Injection quantity is determined by the 

pump unit and injector in combination.

Of course, the DMCI electronic unit requires 

various sensors to control these two components 

correctly in order to determine the injection timing 

and the correct quantity of fuel to be injected.

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DMCI ENGINE MANAGEMENT SYSTEM

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©

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System description

XF105 series

1.2 ELECTRICAL SYSTEM

The electronic unit is the central control device of 

the DMCI engine management system. The 

functions can be split into engine functions and 

vehicle functions.

Note:

Functions may be optional or may depend on the 

vehicle configuration.

Engine functions:

-

system status

-

CAN  controls

-

pre-glowing and after-glowing

-

control of fuel supply

-

cylinder detection and synchronisation

-

fuel injection when starting

-

injection timing control

-

idling control

-

turbocharger pressure control

-

smoke limitation

-

full-load limiting and engine protection 

functions

-

engine brake control

-

fan clutch control

Vehicle functions:

-

Cruise control

-

downhill speed control

-

vehicle speed limiting prescribed by law

-

variable vehicle speed limiting

-

vehicle speed limiting for special applications

-

engine speed control

-

CAN  controls

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System description

DMCI ENGINE MANAGEMENT SYSTEM

XF105 series

The DMCI electronic unit needs different input 

signals to control engine and vehicle functions 

and various components are activated by output 

signals.

Input signals
The most important input signals are:

-

clutch proximity switch (E575)

-

service brake (G469)

-

accelerator pedal sensor (F672)

-

neutral position switch (F593/F599)

-

oil level sensor (F673)

-

2

nd

 coolant temperature sensor (F743)

-

coolant temperature sensor (F566)

-

air inlet boost pressure and temperature 

sensor (F649)

-

engine oil pressure and temperature sensor 

(F744)

-

fuel pressure and temperature sensor (F713)

-

crankshaft sensor (F552)

-

camshaft sensor (F558)

-

electronically controlled fan clutch (B335)

-

glow relay (G014)

i400991

E575

B335

D310

D899

B368

B192

B010

G014

B411/
B412/
B413/
B414/
B415/
B416/

B421/
B422/
B423/
B424/
B425/
B426/

B131/
B132/
B133/
B134/
B135/
B136/

F672

E593/
E599

F552

F566

F649

F743

F673

G469

F744

F713

F558

D965

CAN

network

VIC

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©

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System description

XF105 series

Output signals
After processing of the input signals, output 

signals control the following components:

-

electronically controlled fan clutch (B335)

-

red warning VIC-2 (D310)

-

waste gate valve (B368)

-

starter motor (B010)

-

exhaust brake valve (B192)

-

DEB solenoid valves (B411 to B416)

-

glow relay (G014)

-

pump units (B131 to B136)

-

injectors (B421 to B426)

The DMCI communicates with the various other 

electronic systems in the vehicle via the CAN 

network.

DAVIE XD is used to diagnose faults on the 

DMCI.